//#define  _CRT_SECURE_NO_WARNINGS 1
//#include<stdio.h>
//#include<assert.h>
//int my_strcmp(char* destination, char* source)
//{
//	assert(destination && source);
//	while (*destination == *source)
//	{
//		if (*destination == 0)
//			return 0;
//		destination++;
//		source++;
//	}
//	return *destination - *source;
//}
//int main()
//{
//	char arr1[] = "tanli";
//	char arr2[] = "raocai";
//	printf("%d", my_strcmp(arr1, arr2));
//	return 0;
//}